壳聚糖吸附剂脱除燃煤模拟烟气中汞的试验研究

采用在线检测法检测了纯氮气气氛下及模拟烟气气氛下高分子化合物壳聚糖吸附剂对单质汞的吸附特性,结果表明,温度升高有利于脱汞反应的进行,纯氮气氛下脱除汞单质效率不高,60℃时为28.85%, 120℃时升为38.46%;氮氧化物、硫氧化物对汞的脱除有一定的促进作用,在模拟烟气气氛下120℃时吸附剂出口平衡吸附率为48.05%,平均吸附率约68%.红外光谱分析揭示了壳聚糖吸附剂吸附烟气中汞的机理为2个游离氨基与2个羟基鳌合1个汞原子或汞离子.

Experiment of the macromolecular chitosan adsorbent to remove element mercury in the simulative flue gas of coal combustion.

An experiment was conducted to study the Chitosan (CS) sorbent’s adsorption efficiency of element mercury in pure N2 and simulative coal-fired flue gas. The element mercury was difficult to remove in the pure N2, the adsorption efficiency was 28.85% at 60℃, but the CS sorbent could adsorb Hg0 effectively with the temperature’s rising, at 120℃ the adsorption efficiency was 38.46%. And the SOx and NOx could promote the element mercury adsorption efficiency, at 120℃, in the simulative coal-fired flue gas, the balance adsorption efficiency of the chitosan sobent was 48.05% and the average adsorption efficiency was almost up to 68%. By infrared spectrum analyzing, the results showed the mechanism of chitosan sorbent adsorbing mercury was that 2 free amino and 2 hydroxyls(-OH)chelated 1 mercury to be a ring.